Which are the different corrosion classes
As per the ISO 12944-2:2017 standard
- C1 – very low
- Heated buildings with healthy atmosphere. E.g.: offices, shops, schools, hotels.
- C2 – low
- Atmosphere with a low pollution level. E.g.: rural areas.
- Non-heated buildings with possible occurrence of condensation. E.g.: depots, sports halls.
- C3 – medium
- Urban and industrial atmospheres, moderate sulphur dioxide pollution. E.g.: coastal area with low salinity.
- Production rooms with high humidity and some air pollution. E.g.: breweries, laundries, food-processing plants.
- C4 – high
- Industrial areas and coastal areas with moderate salinity. E.g.: chemical plants, swimming pools.
- C5 – very high
- Industrial areas and coastal areas with high humidity and aggressive atmosphere, coastal areas with high salinity.
- Buildings or areas with almost permanent condensation and high pollution.
- CX – extreme
- Offshore areas with high salinity and industrial areas with extreme humidity, aggressive atmosphere and sub-tropical and tropical atmospheres.
- Industrial areas with extreme humidity and aggressive atmosphere.
- Im1 – immersion in fresh water
- Structures in rivers (dams), hydroelectric power stations.
- Im2 – immersion in sea or brackish water without cathodic protection
- Immersed structures without cathodic protection. E.g.: port zones with structures. E.g.: lock valves, landing stages.
- Im3 – burial in soil
- Cisterns buried in the ground, pipes and steel piles.
- Im4 – immersion in sea or brackish water with cathodic protection
- Structures immersed into water, with cathodic protection. E.g.: offshore structures
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